A make-and-break mechanism for handling phase-to-phase faults

Abstract

The application discloses a kind of on-off mechanism for processing phase-to-phase fault, including two single-pole double-throw switches and a third switch, single-pole double-throw switch includes first arc chamber and second arc chamber, first fixed contact is provided in first arc chamber, second fixed contact is provided in second arc chamber, first composite movable contact is provided between first arc chamber and second arc chamber, first composite movable contact one end is located in first arc chamber, first composite movable contact other end is located in second arc chamber, first composite movable contact is connected with first fixed contact when then is disconnected with second fixed contact, first composite movable contact is connected with second fixed contact when then is disconnected with first fixed contact;Third switch includes third arc chamber, third fixed contact and third movable contact are provided in third arc chamber.The on-off mechanism structure is simple, can realize one fault phase conduction and make another fault phase connect ground or public wire, and it is convenient to be used with existing screen cabinet, with important practical value.

Description

TECHNICAL FIELD

[0001] The present application relates to a device for making circuit on-off, in particular to a on-off mechanism for processing phase-to-phase short circuit fault. BACKGROUND

[0002] At present, the processing of phase-to-phase short circuit fault of power supply system has problems such as complicated operation, untimely, inaccurate positioning, etc., which affects the power supply quality. The invention patent application 202011453631.0, invention patent application 202011453632.5, invention patent application 202110420475.6 and invention patent 202110420952.9 provide a processing method for phase-to-phase short circuit of power supply system. According to the method, when phase-to-phase short circuit occurs, one fault phase is maintained to be on and the remaining fault phases are tripped, then another fault phase is connected to ground or common conductor, and then one live phase is connected to ground or common conductor to form a closed loop with the two fault phases connected by short circuit and generate current or current pulse, and then the controlled switch detects the current duration or the number of current pulses and trips to remove the fault. At present, the operation of cutting off and conducting the circuit is generally completed in the screen cabinet, therefore, it is of great significance to provide a on-off device suitable for screen cabinet operation to maintain one fault phase to be on and make another fault phase connected to ground or common conductor for promoting the landing and popularization of the above-mentioned invention method. SUMMARY

[0003] The purpose of the present application is to provide a on-off mechanism for processing phase-to-phase short circuit fault, which has simple structure, can realize one fault phase to be on and another fault phase to be connected to ground or common conductor, and is convenient to use with existing screen cabinet, and has important practical value.

[0004] In order to achieve the above-mentioned purpose, the present application adopts the following technical scheme:

[0005] A on-off mechanism for processing phase-to-phase fault, comprising two single-pole double-throw switches and a third switch, the single-pole double-throw switch comprising a first arc extinguishing chamber and a second arc extinguishing chamber, a first static contact being provided in the first arc extinguishing chamber, a second static contact being provided in the second arc extinguishing chamber, a first composite moving contact being provided between the first arc extinguishing chamber and the second arc extinguishing chamber, one end of the first composite moving contact being located in the first arc extinguishing chamber, the other end of the first composite moving contact being located in the second arc extinguishing chamber, the first composite moving contact being in contact with the first static contact and being disconnected with the second static contact, the first composite moving contact being in contact with the second static contact and being disconnected with the first static contact; the third switch comprising a third arc extinguishing chamber, a third static contact and a third moving contact being provided in the third arc extinguishing chamber.

[0006] Preferably, the single-pole double-throw switch is located in the first insulating sleeve, the first insulating sleeve is in communication with the first branch cylinder, the second branch cylinder and the third branch cylinder respectively, the first branch cylinder is provided with a first conductive connector at one end, the first conductive connector is electrically connected with the first static contact, the second branch cylinder is provided with a second conductive connector at one end, the second conductive connector is electrically connected with the first composite moving contact, the third branch cylinder is provided with a third conductive connector at one end, the third conductive connector is electrically connected with the second static contact, and the first driving rod is further provided on the first insulating sleeve, the first driving rod is connected with the first composite moving contact and can drive the first composite moving contact to move; the third switch is located in the second insulating sleeve, the second insulating sleeve is in communication with the fourth branch cylinder and the fifth branch cylinder respectively, the fourth branch cylinder is provided with a fourth conductive connector at one end, the fourth conductive connector is electrically connected with the third static contact, the fifth branch cylinder is provided with a fifth conductive connector at one end, the fifth conductive connector is electrically connected with the third moving contact, and the second driving rod is further provided on the second insulating sleeve, the second driving rod is connected with the third moving contact and can drive the third moving contact to move.

[0007] Preferably, the first insulating sleeve is provided with a first support, and the first support is fixedly connected with the first composite moving contact and the first driving rod respectively.

[0008] Preferably, the first composite moving contact is composed of a first moving contact and a second moving contact through a flange.

[0009] Preferably, the first driving rod is connected with a first swing arm, the first swing arm is connected with a first energy storage mechanism and is driven by the first energy storage mechanism, the second driving rod is connected with a second swing arm, the second swing arm is connected with a second energy storage mechanism and is driven by the second energy storage mechanism.

[0010] Preferably, the first energy storage mechanism, the second energy storage mechanism, the two single-pole double-throw switches and the third switch are installed on a sliding table.

[0011] In the above technical solution, when the first composite moving contact of the single-pole double-throw switch is disconnected from the first stationary contact, it is connected to the second stationary contact, thus achieving the connection of another fault phase to the ground or utility conductor while the disconnection of the third fault phase. Maintaining the conduction of one fault phase only requires that the switch of the fault phase does not act. If it is a three-phase short circuit, the third phase can be tripped (i.e., the third switch in the present application can be tripped), thus achieving the method required in the invention patent application 202011453631.0 and the invention patent application 202011453632.5 to maintain the conduction of one fault phase and ground (or connect to the utility conductor) the other fault phase. The third switch in the on-off device can be a single-pole single-throw switch, which is an optimized design for the above functions, with simple structure and good control of manufacturing cost; the third switch can also be a single-pole double-throw switch, but an arc chamber will be added accordingly, increasing the cost, but the control logic will be relatively simpler. The on-off device is used with a sliding table, which can well adapt to the pushcart type switch operation of the existing screen cabinet, and has important practical and popularization value. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 is a schematic diagram of the principle of the present application;

[0013] Figure 2 is a schematic diagram of the structure of the present application;

[0014] Figure 3 is a schematic diagram of the structure of the present application. DETAILED DESCRIPTION

[0015] The specific embodiments of the present application will be further described in detail below in combination with the drawings and examples, which are used to illustrate the present application but not to limit the scope of the present application.

[0016] On the basis of the existing S1-12 type handcart type indoor AC vacuum circuit breaker with three vacuum arc chambers, two more vacuum arc chambers are added to realize the function of five-pole switch. Specifically, as shown in Figure 1 , Figure 2 and Figure 3As shown, the on-off device comprises two single-pole double-throw switches 100 and a third switch 99. The single-pole double-throw switch 100 comprises a first arc-extinguishing chamber 12 and a second arc-extinguishing chamber 9. A first stationary contact 122 is fixed in the first arc-extinguishing chamber 12, and a part of the first stationary contact 122 is outside the first arc-extinguishing chamber and used for connecting with a phase line. A second stationary contact 902 is fixed in the second arc-extinguishing chamber 9, and a part of the second stationary contact is outside the second arc-extinguishing chamber and used for connecting with the ground or a utility line. A first composite moving contact 123 is arranged between the first arc-extinguishing chamber 12 and the second arc-extinguishing chamber 9. One end of the first composite moving contact 123 is located in the first arc-extinguishing chamber 12, and the other end is located in the second arc-extinguishing chamber 9. When the first composite moving contact 123 moves upward, it will be in contact with the first stationary contact 122 to be conductive and will be separated from the second stationary contact 902 to be non-conductive. When the first composite moving contact 123 moves downward, it will be in contact with the second stationary contact 902 to be conductive and will be separated from the first stationary contact to be non-conductive. The first composite moving contact 123 is connected with the phase line. The above-mentioned conditions correspond to the switch K in the A phase respectively Figure 1 A The state of connecting the phase line A1 with the phase line A2 (separated from the ground or the utility line), or the switch K AD The state of connecting the phase line A2 with the ground (or the utility line) (separated from the phase line A1). Or, the above-mentioned conditions correspond to the switch K in the C phase respectively Figure 1 C The state of connecting the phase line C1 with the phase line C2 (separated from the ground or the utility line), or the switch K CD The state of connecting the phase line C2 with the ground (or the utility line) (separated from the phase line C1). The third switch 99 comprises a third arc-extinguishing chamber 991, and a third stationary contact and a third moving contact 992 are fixed in the third arc-extinguishing chamber. When the third switch 99 is closed, it corresponds to Figure 1 B The state of connecting the phase line B1 with the phase line B2.

[0017] ​​​In a preferred embodiment, three insulation sleeves are provided, two single-pole double-throw switches 100 are respectively placed in two first insulation sleeves 1, the first insulation sleeves 1 are in sealed communication with the first branch sleeve 101, the second branch sleeve 102 and the third branch sleeve 103 along the upper, middle and lower three orientations, a first conductive connector 13 is arranged at one end of the first branch sleeve 101, the first conductive connector 13 is electrically connected with the first static contact 122 through the conductive lead-out plate 121, a second conductive connector 14 is arranged at one end of the second branch sleeve 102, the second conductive connector 14 is soft-connected with the first composite moving contact 123 through the soft conductor 11 to cooperate with the up and down movement of the first composite moving contact and realize conduction. A third conductive connector 15 is arranged at one end of the third branch sleeve 103, the third conductive connector 15 is electrically connected with the second static contact 902 through the conductive lead-out plate 901. The first conductive connector 13, the second conductive connector 14 and the third conductive connector 15 are used to be inserted into the corresponding electrical connection seat on the screen cabinet, so that the first static contact 122, the second static contact 902 and the first composite moving contact 123 are in communication with the external circuit, which is the same as the operation mode of the existing S1-12 type handcart type indoor alternating current vacuum circuit breaker, so that the on-off device can adapt to the screen cabinet operation, meet the screen cabinet operation rules and safety standards, and greatly improve the operation safety. Similarly, the third switch 99 is placed in the second insulation sleeve, the second insulation sleeve is provided with a fourth branch sleeve and a fifth branch sleeve, a fourth conductive connector is arranged on the fourth branch sleeve for electrical connection with the third static contact, and a fifth conductive connector is arranged on the fifth branch sleeve for electrical connection with the third moving contact 992. The two first insulation sleeves 1 and the second insulation sleeve are installed on the insulation sleeve support seat 3.

[0018] In an embodiment, a first drive rod is also arranged on the first insulation sleeve 1, the first drive rod 7 is connected with the first composite moving contact 123 and can drive the first composite moving contact to move. In a specific embodiment, a first support 8 is arranged, one end of the first support 8 is fixedly connected with the first drive rod 7, and the other end is fixedly connected with the first composite moving contact 123, so that the movement of the first drive rod is transmitted to the first composite moving contact 123. The second drive rod 6 penetrates into the second insulation sleeve and is fixedly connected with the third moving contact 992, so that the third moving contact can be driven to move.

[0019] In an embodiment, the first composite moving contact 123 is composed of the first moving contact 904 and the second moving contact 903 through the flange 10. The first support 8 and the soft conductor 11 are also fixed on the flange.

[0020] In one embodiment, the first drive rod 7 is connected with the first swing arm 16, the first swing arm 16 is connected with and driven by the first energy storage mechanism 2, the second drive rod 6 is connected with the second swing arm, and the second swing arm is connected with and driven by the second energy storage mechanism. The first energy storage mechanism 2, the second energy storage mechanism, the two single-pole double-throw switches 100 and the third switch 99 are installed on the sliding table 4, and by pushing the sliding table 4 into the screen cabinet, the above-mentioned conductive contacts are connected with the conductive connecting seat, and by pulling out the sliding table 4, the above-mentioned conductive contacts are disconnected with the conductive connecting seat.

[0021] In use, by pushing the sliding table 4 into the screen cabinet, each conductive contact is combined with the corresponding conductive connecting seat, the first composite moving contact 123 is in conduction with the first stationary contact 122, and the third moving contact 992 is in conduction with the third stationary contact. When an inter-phase fault occurs and needs to be handled according to the method of the invention patent application 202011453631.0 and the invention patent application 202011453632.5, the action is started according to the information fed back by the power system protection device and the preset logic of the on-off device, such as an AB inter-phase short circuit. The third switch 99 of the B phase is kept in conduction, and the first composite moving contact 123 of the single-pole double-throw switch 100 is moved downward, so as to be disconnected with the first stationary contact and in conduction with the second stationary contact (in this way, the A-phase outgoing line connected with the first composite moving contact 123 is disconnected with the A-phase outgoing line connected with the busbar, and the A-phase outgoing line connected with the first composite moving contact 123 is connected with the ground or the utility conductor, and by cooperating with other devices, one live phase of the busbar or the system neutral point is connected with the ground or the utility conductor, a current pulse or a continuous current can be generated, so that the controlled switch can be used to cut off the fault point). If it is an ABC three-phase inter-phase short circuit, the third switch of the B phase can be tripped, the single-pole double-throw switch 100 of the C phase is kept in conduction, and the single-pole double-throw switch 100 of the A phase is switched to be connected with the ground or the utility conductor.

[0022] The above is only the preferred embodiment of the present application, and it should be pointed out that for ordinary skilled persons in the technical field, some improvements and modifications can be made without departing from the technical principles of the present application, and these improvements and modifications should also be regarded as the protection scope of the present application.

Claims

1. A throw-over mechanism for handling phase-to-phase faults, comprising two single-pole double-throw switches and a third switch, characterized in that: The single-pole double-throw switch comprises a first arc-extinguishing chamber, a second arc-extinguishing chamber, a first static contact provided in the first arc-extinguishing chamber, a second static contact provided in the second arc-extinguishing chamber, and a first composite moving contact provided between the first arc-extinguishing chamber and the second arc-extinguishing chamber, one end of the first composite moving contact being located in the first arc-extinguishing chamber and the other end of the first composite moving contact being located in the second arc-extinguishing chamber, the first composite moving contact being in contact with the first static contact and being disconnected from the second static contact, and the first composite moving contact being in contact with the second static contact and being disconnected from the first static contact; the third switch comprises a third arc-extinguishing chamber, a third static contact and a third moving contact provided in the third arc-extinguishing chamber, The single-pole double-throw switch is located in a first insulating sleeve, the first insulating sleeve being in communication with a first branch cylinder, a second branch cylinder and a third branch cylinder, one end of the first branch cylinder being provided with a first conductive connector, the first conductive connector being electrically connected with the first static contact, one end of the second branch cylinder being provided with a second conductive connector, the second conductive connector being electrically connected with the first composite moving contact, one end of the third branch cylinder being provided with a third conductive connector, the third conductive connector being electrically connected with the second static contact, a first driving rod being further provided on the first insulating sleeve, the first driving rod being connected with the first composite moving contact and being capable of driving the first composite moving contact to move; the third switch is located in a second insulating sleeve, the second insulating sleeve being in communication with a fourth branch cylinder and a fifth branch cylinder, one end of the fourth branch cylinder being provided with a fourth conductive connector, the fourth conductive connector being electrically connected with the third static contact, one end of the fifth branch cylinder being provided with a fifth conductive connector, the fifth conductive connector being electrically connected with the third moving contact, a second driving rod being further provided on the second insulating sleeve, the second driving rod being connected with the third moving contact and being capable of driving the third moving contact to move; The first driving rod is connected with a first swing arm, the first swing arm being connected with a first energy storage mechanism and being driven by the first energy storage mechanism, and the second driving rod is connected with a second swing arm, the second swing arm being connected with a second energy storage mechanism and being driven by the second energy storage mechanism; The first energy storage mechanism, the second energy storage mechanism, the two single-pole double-throw switches and the third switch are installed on a sliding table, and the sliding table can be pushed into a screen cabinet; A first support is provided in the first insulating sleeve, the first support being fixedly connected with the first composite moving contact and the first driving rod.

2. The on-off mechanism for handling phase-to-phase faults of claim 1, wherein, The first composite moving contact is composed of a first moving contact and a second moving contact through flange connection.

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